InstallerConnection.java revision 4e321745173de1eb89343238fadfbcc7ba1a88f9 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License
15 */
16
17package com.android.internal.os;
18
19import android.net.LocalSocket;
20import android.net.LocalSocketAddress;
21import android.os.SystemClock;
22import android.util.Slog;
23import libcore.io.IoUtils;
24import libcore.io.Streams;
25
26import java.io.IOException;
27import java.io.InputStream;
28import java.io.OutputStream;
29
30/**
31 * Represents a connection to {@code installd}. Allows multiple connect and
32 * disconnect cycles.
33 *
34 * @hide for internal use only
35 */
36public class InstallerConnection {
37    private static final String TAG = "InstallerConnection";
38    private static final boolean LOCAL_DEBUG = false;
39
40    private InputStream mIn;
41    private OutputStream mOut;
42    private LocalSocket mSocket;
43
44    private final byte buf[] = new byte[1024];
45
46    public InstallerConnection() {
47    }
48
49    public synchronized String transact(String cmd) {
50        if (!connect()) {
51            Slog.e(TAG, "connection failed");
52            return "-1";
53        }
54
55        if (!writeCommand(cmd)) {
56            /*
57             * If installd died and restarted in the background (unlikely but
58             * possible) we'll fail on the next write (this one). Try to
59             * reconnect and write the command one more time before giving up.
60             */
61            Slog.e(TAG, "write command failed? reconnect!");
62            if (!connect() || !writeCommand(cmd)) {
63                return "-1";
64            }
65        }
66        if (LOCAL_DEBUG) {
67            Slog.i(TAG, "send: '" + cmd + "'");
68        }
69
70        final int replyLength = readReply();
71        if (replyLength > 0) {
72            String s = new String(buf, 0, replyLength);
73            if (LOCAL_DEBUG) {
74                Slog.i(TAG, "recv: '" + s + "'");
75            }
76            return s;
77        } else {
78            if (LOCAL_DEBUG) {
79                Slog.i(TAG, "fail");
80            }
81            return "-1";
82        }
83    }
84
85    public int execute(String cmd) {
86        String res = transact(cmd);
87        try {
88            return Integer.parseInt(res);
89        } catch (NumberFormatException ex) {
90            return -1;
91        }
92    }
93
94    public int dexopt(String apkPath, int uid, boolean isPublic,
95            String instructionSet, int dexoptNeeded, boolean bootComplete) {
96        return dexopt(apkPath, uid, isPublic, "*", instructionSet, dexoptNeeded,
97                false, false, null, bootComplete);
98    }
99
100    public int dexopt(String apkPath, int uid, boolean isPublic, String pkgName,
101            String instructionSet, int dexoptNeeded, boolean vmSafeMode,
102            boolean debuggable, String outputPath, boolean bootComplete) {
103        StringBuilder builder = new StringBuilder("dexopt");
104        builder.append(' ');
105        builder.append(apkPath);
106        builder.append(' ');
107        builder.append(uid);
108        builder.append(isPublic ? " 1" : " 0");
109        builder.append(' ');
110        builder.append(pkgName);
111        builder.append(' ');
112        builder.append(instructionSet);
113        builder.append(' ');
114        builder.append(dexoptNeeded);
115        builder.append(vmSafeMode ? " 1" : " 0");
116        builder.append(debuggable ? " 1" : " 0");
117        builder.append(' ');
118        builder.append(outputPath != null ? outputPath : "!");
119        builder.append(bootComplete ? " 1" : " 0");
120        return execute(builder.toString());
121    }
122
123    private boolean connect() {
124        if (mSocket != null) {
125            return true;
126        }
127        Slog.i(TAG, "connecting...");
128        try {
129            mSocket = new LocalSocket();
130
131            LocalSocketAddress address = new LocalSocketAddress("installd",
132                    LocalSocketAddress.Namespace.RESERVED);
133
134            mSocket.connect(address);
135
136            mIn = mSocket.getInputStream();
137            mOut = mSocket.getOutputStream();
138        } catch (IOException ex) {
139            disconnect();
140            return false;
141        }
142        return true;
143    }
144
145    public void disconnect() {
146        Slog.i(TAG, "disconnecting...");
147        IoUtils.closeQuietly(mSocket);
148        IoUtils.closeQuietly(mIn);
149        IoUtils.closeQuietly(mOut);
150
151        mSocket = null;
152        mIn = null;
153        mOut = null;
154    }
155
156
157    private boolean readFully(byte[] buffer, int len) {
158        try {
159            Streams.readFully(mIn, buffer, 0, len);
160        } catch (IOException ioe) {
161            Slog.e(TAG, "read exception");
162            disconnect();
163            return false;
164        }
165
166        if (LOCAL_DEBUG) {
167            Slog.i(TAG, "read " + len + " bytes");
168        }
169
170        return true;
171    }
172
173    private int readReply() {
174        if (!readFully(buf, 2)) {
175            return -1;
176        }
177
178        final int len = (((int) buf[0]) & 0xff) | ((((int) buf[1]) & 0xff) << 8);
179        if ((len < 1) || (len > buf.length)) {
180            Slog.e(TAG, "invalid reply length (" + len + ")");
181            disconnect();
182            return -1;
183        }
184
185        if (!readFully(buf, len)) {
186            return -1;
187        }
188
189        return len;
190    }
191
192    private boolean writeCommand(String cmdString) {
193        final byte[] cmd = cmdString.getBytes();
194        final int len = cmd.length;
195        if ((len < 1) || (len > buf.length)) {
196            return false;
197        }
198
199        buf[0] = (byte) (len & 0xff);
200        buf[1] = (byte) ((len >> 8) & 0xff);
201        try {
202            mOut.write(buf, 0, 2);
203            mOut.write(cmd, 0, len);
204        } catch (IOException ex) {
205            Slog.e(TAG, "write error");
206            disconnect();
207            return false;
208        }
209        return true;
210    }
211
212    public void waitForConnection() {
213        for (;;) {
214            if (execute("ping") >= 0) {
215                return;
216            }
217            Slog.w(TAG, "installd not ready");
218            SystemClock.sleep(1000);
219        }
220    }
221}
222